Every year, over 300,000 Americans get a hip replacement, most of them as the result of hip trauma or wear and tear that accumulates over time. "Hip replacement surgery uses metal, plastic, or ceramic parts to take the place of a diseased or damaged hip," says Dr. Michael Bronson from The Mount Sinai Medical Center. "Just about everybody is at risk of needing a hip replacement one day because so many common things lead to hip arthritis, which causes the cartilage protecting the hip socket to wear away." Learn more